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        Simple models of three coupled PT-symmetric wave guides allowing for third-order exceptional points 

        Schnabel, Jan; Cartarius, Holger; Main, Jorg; Wunner, Gunter; Heiss, Walter Dieter (Czech Technical University--Prague, 2017-08)
        We study theoretical models of three coupled wave guides with a PT-symmetric distribution of gain and loss. A realistic matrix model is developed in terms of a three-mode expansion. By comparing with a previously postulated ...

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